Dynamo-electric machine



March 31, 1931. H s n- 1,799,071

DYNAMO'ELECTRIC MACHINE Original Filed March 9. 1928 2 Sheets-Sheet lflier/2hr" f are/(2 fin/ii March 31, 1931. sMlTH 1,799,0'Z1

DYNAMO ELECTRIC MACHINE Original Filed March 9, 1928 2 Sheets-Sheet 2Flu-1.4.

Patented Mar. 31, 1931 UNITED STATES PATENT OFFICE HAROLD L. SMITH, OFMILWAUKEE, WISCONSIN, ASS IGNOR '1'0 THE LOUIS ALLIS COMPANY, OFMILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN Dynamo-Emerald MACHINEContinuation of application Serial No. 260,330, filed March 9, 1928, andin Canada April 27, 1928. This application filed May 9, 1929. Serial No.361,767.

The invention relates to a dynamo electric machine and applies tovarious types thereof.

The present application is a continuation of an original applicationSerial No. 260,330,

filed March 9, 1928.

The dynamo electric machine to which the I ends, and the rotor isprovided with a shaft having a bearing in each end plate..

The invention has for its object to provide a dynamo electric machinewhich has formed within itself a closed inner casing to resist andconfinea gaseous explosion within its interior and prohibit ignited orexploded gas from escaping to its exterior and which has high capacityand efficiency for a given size core and given over-all dimensions.

According to this invention as it is ordinarily practiced, the stator.is provided with alaminated core having its heat dissipated to externalair by direct metallic, conduction, I an end plate is arranged upon eachend of the statorand forms therewith a closed inner casing havingsufficient strength to resist and and an open outer casing is arrangedoutside the inner casing to conduct external air over the core.

The dynamo electric machine which is hereinafter described and shown inthe accompanying drawings to exemplify the invention" is an inductionmotor. 7 I

The drawings illustratea preferred motor and a modified motor, and theviews therein are as follows Fig. l is a front sectional view of the,re};

ferred motor Fig. 2 is an end View thereof; Fig. 3 is a transversesectional view through the conduit box;

thereof a removable closed end form therewith a closed inner casinghaving 4 isa front sectional view of the modi- Fig. .5 is an end viewthereof.

' .Fz'gs.1t03 The preferred motor isprovided with a stator having alaminated core 1 carrying a primary Winding and a rotor having a lami-'nated core 2 carrying a secondary winding. The stator has arranged uponeach end plate 3 to suificient strength to resist and confine a gaseousexplosion within its interior;

The stator. core has its laminations arranged within -a heat conductingshell 4 or other casing exposed to external air.

external air.

The laminations are bound together by an end ring 5 arranged upon eachend thereof and welded or otherwise fastened to the shell.

The rotor core is arranged within the stator core and it is carried by ashaft 6 having a ball bearing 7 in each end plate.

The ball bearing is arranged within a socket 8 formed in the end plate,and it is held therein by a removable cap 9 fastened to the end plate bybolts 10.

The end plate has formed thereon a peripheral flange 11 extending overand around its adjacent end ring to form therewith an elongated jointbetween the end plate and the stator, 4 L

The elongated joint thus formed between the end plate and the stator hassufiicient length to quench ignited or exploded gas from within thein'ner'cas'ing before it reaches the exterior thereof."

The end plate has formed thereon apart from the bearing for theshaft acentral sleeve 12 extending over and around the shaft to form anelongated joint between the end plate and the shaft.

The elongated joint thus formed between the-end plate and the shaft hassufficient length =to:.quench Iignited or exploded gas from within theinner casing before it reaches the exterior thereof.

The end plates are connected to each other by eonnet'zting boltsarranged outside the inner casing and havingnuts 14 upon the endsthereof.

The connecting bolts fasten the end plates upon the stator, and eachcndplateis held thereby in iirm engagement with its adjacent end ring.

The inner casing has arranged upon the outside thereof an open outercasing 15 to cbnduct external. air over the core, and it has arrangedupon the end thereof a removable end casing 16 to conduct external airto the outer casing.

The outer casing extends over the connecting bolts between the endplates and it is carried thereby.

The end casing is carried by its adjacent end plate and it is held inplace thereon by nuts 17 upon extended connecting bolts.

The outer casing has external air circulated therethrough and over thecore by a fan 18 arranged in'the end casing and carried by the shaft;

The end casing is provided with a central inlet opening 19 to admitexternal air thereto.

The primary stator winding is connected in circuit by terminalconductors 20 extending into the inner casing through a conduit box 21having removable cover 22.

The conduit box is supported upon a conical thimble welded or otherwisefastened to an end ring.

-The terminal conductors are surrounded within the thimble by anincremable subsLanCe 23' to seal the passage therefor from the innercasing to the conduit box.

The stator is carried and supported upon a base 24'by its core beingmounted thereon in any suitableway.

The motor which has been explained has high capacity and efiiciency fora given size core and given over-all dimensions, even though it isenclosed within a closed inner casing, as its core dissipates its heatat a high rate by direct metallicconduction to external air.

Figs. 4 and 5 The modified motor is in general the same as the preferredmotor, and the same reference numerals are applied to correspondingparts thereof.

The stator core has its laminations bound vtogether by welding 25 acrossthe periphery 01 outside thereof.

The laminations are exposed to direct contact with external air, and theheat is dissipat -d therefrom by direct metallic conduction 10 externalair.

The end plate bears upon the laminations instead of upon an interveningend ring, and its flange extends over the laminations to (F formtherewith an elongated joint.

. arrange Various dynamo electric machines may be devised which embodythe invention herein set forth and defined in the hereinafter claims.

The invention which has been shown and described is hereby claimed asfollows:

1. A dynamo electric machine, comprising a stator provided with alaminated core having its heat dissipated to external air by direetmetallic conduction, a separate closed end plate arranged upon each endof 'said stator and forming therewith a closed inner casing havingsufiicient strength to resist a gaseous explosion within its interior,means between each end plate and said stator to quench ignited gas fromwithin said inner casing before it reaches the exterior thereof,fasteners to retain said end plates in a firm position upon said stator,a rotor arranged within said stator and having its shaft bearing in saidend plates, means between each end late and said shaft to quench ignitedgas rom within said inner casing before it reaches the exterior thereof,and an outer casing arranged around said inner casing to form aventilating space for the passage of external air over said core.

2. A dynamo electric machine, comprising a stator provided with alaminated core having its heat dissipated to external air by directmetallic conduction, a separate closed end plate arranged upon each endof said stator and forming therewith a closed inner casing havingsufiicient strength to resist a gaseous explosion within its interior,means between each end plate and said stator to quench. ignited gas fromwithin said inner casing before it reaches the exterior thereof,

bolts connecting said end lates together to retain said end plates in arm position upon said stator, a rotor arranged within said stator andhaving its shaft bearing in said end plates, means between each endplate and saidshaft to quench ignited gas from. within said inner casingbefore it reaches the exterior thereof, and an outer casing arrangedaround said inner casing to form a ventilating space for the passage ofexternal air over said core.

3. A dynamo electric machine, comprising a stator provided with alaminated core having its outside surface between its ends exposed toexternal air, a separate closed end plate arranged upon each end of saidcore and forming therewith a closed inner casing having sufiicientstrength to resist a gaseous explosion within its interior, fasteners toretain said end lates in place upon said core, a rotor within saidstator and having its shaft bearing in said end plates, an elongatedjoint'formed between each end plate and said core and between each endplate and said shaft and having sufiicient length to quench thereinignited gas from within said inner casing, and an outer casing arrangedaround said inner casing to form a ventilating space for the passage ofexternal air over saic inner casing in direct contact with said core.

4. A dynamo electric machine, comprising a stator provided with alaminated core having its outside surface between its ends exposed toexternal air, a separate closed end plate arranged upon each end of saidcore and forming therewith a closed inner casing having sufficientstrength to resist a gaseous explosion within its interior, boltsconnecting said end plates together to retain said end plates in a firmposition upon said core, a rotor arranged Within said stator and havingits shaft bearing in said end plates, an elongated joint formed betweeneach end plate and said core and between each end plate and said shaftand having sufficient length to quench therein ignited gas from withinsaid inner casing, and an outer casing arranged around said inner casingto form a ventilating space for the passage of external air over saidinner casing in direct contact with said core.

5. A dynamo electric machine, comprising a stator provided with alaminated core having its outside surface between its ends exposed toexternal air, a separate closed end plate arranged upon each end of saidcore and forming therewithaclosed inner casing having suflicientstrength t'o-resist a gaseous explosion within its interior,boltsconnecting said end plates together to retaiItsa-id end plates in a firmposition upon said core, a rotor arranged within said stator and havingits shaft bearing in said end plates, an elongated joint formed betweeneach end plate and said core and between each end plate and said shaftand having sufficient length to quench therein ignited gas from withinsaid inner casing, an outer casing arranged around said inner casing toform a ventilating space for the passage of external air over said innercasing in direct contact with said core, and a fan arranged upon theoutside of said inner casing and carried by said shaft.

6. A dynamo electric machine, comprising a stator provided with alaminated core having its outside surface between its ends exposed toexternal air, a separate closed end plate arranged upon each end of saidcore and forming therewith a closed inner casing having sufficientstrength to resist a gaseous explosion within its interior, boltsconnecting said end plates together to retain said end plates in a firmposition upon said core, a rotor arranged within said stator and havingits shaftbearing in said end plates, an elongated joint formed betweeneach end plate and said core and between each end plate and said shaftand having sufficient length to quench therein ignited gas from withinsaid inner casing. an outer casing arranged around said inner casing toform a ventilating space for the passage of external air over said innercasing in direct contact with said core, a fan arranged upon the outsideof said inner casing, and a removable end casing arranged upon acorresponding end plate to enclose said fan and retained in place bysaid bolts.

7. A dynamo electric machine, comprising a stator provided with alaminated core ha"- ing its heat dissipated to external air by directmetallic conduction, a separate closed end plate arranged upon eachend'of said core and forming therewith a closed inner casing havingsufficient strength to resist a gaseous explosion within its interior,fasteners to retain said end plates in place upon said core, a rotorarranged within said stator and having its shaft bearing in said endplates, an elongated joint formed between each end plate and said coreand having sufficient length to quench ignited gas from within saidcasing before it reaches the exterior thereof, an elongated sleevecarried by each end plate apart from the bearing for said shaft andsurrounding said shaft over a sufiicient length in close relationthereto to quench ignited gas from Within said casing before it reachesthe exterior thereof, and, an outer casing arranged around said innercasing to form a ventilating space for the passa e of external air oversaid core.

8. dynamo electric machine, comprising a stator provided with alaminated core having its heat dissipated to external air by directmetallic conduction, a separate closed end platesarranged upon each endof said core and forming therewith a closed inner casing havingsufficient strength to resist a gaseous explosion within its interior,bolts connecting said end plates together to retain said end plates in afirm position upon said core, a rotor arranged within said stator andhaving its shaft bearing in said end plates, an elongated joint formedbetween each end plate and said core and having sufficient length toquench ignited gas from within said" casing before it reaches theexterior thereof, an elongated sleeve carried by each end plate apartfrom the bearing for said shaft and surrounding said shaft over asuflicient lengthin close relation thereto to quench ignited gas fromwithin said casing before it reaches the exterior thereof, and an outercasing arranged around said inner casing to form a ventilating space forthe passage of external airover said core.

9. A dynamo electric machine, comprising a stator provided with alaminated core having its heat dissipated to external air by directmetallic conduction, a separate closed end plate arranged upon each endof said core aud'forming therewith a closed inner casing havingsufiicicnt strength to resist a gaseous explosion within its interior,bolts connecting said end plates together to retain inclose relationtheretoto quench ignited gas from within said casing before it reachesthe exterior thereof, an outer casing arranged around said inner casingto form a ventilating space for the passage of external air over saidcore, anda fan arranged upon the outside of said inner casing and earnedby said shaft.

10. A dynamo electric machine, comprising a stator provided with alaminated core having its heat dissipated to external air by directmetallic conduction, a separateclosed end plate arranged upon each endof said core and forming therewith a closed inner casing havingsufficient strength to resist a gaseous explosion within its interior,bolts connecting said end plates together to retain said end plates in afirm position'upon said core, a rotor arranged within said stator andhaving its shaft bearing in said end plates, an elongated joint formedbetween each end plate and said core and having sufficient length touench ignited gasfrom within said casing be ore it reaches the exteriorthereof,

an elongated sleeve carried by each end plate apart from the bearing forsaid shaft and surrounding said shaft over a sufficient length in closerelation thereto to quench ignited gas from within said casing before itreaches the exterior thereof, an outer casing arranged around said innercasing to form a ventilating space for the passage of external air oversaid core, a. fan arranged upon the outside ofsaid inner casing, and aremovable end casing arranged upon a corresponding end plate to enclosesaid fan and retained in place y said bolts.

11. A dynamo electric machine comprising a stator provided with alaminated core hav ing its laminations imperforate between its windingslots and its outside and bound together by a binding arranged upon itsexterior in continuous engagement therewith to dissipate heat directtherefrom, a separate closed end plate arranged upon each end of saidcore and forming therewith a closed inner casing having sufficientstrength to resist a gaseous explosion within it's in terior, fastenersto retain said end plates in place upon said core, a rotor arrangedwithin said stator and having its shaft bearing in said end plates, anelongated joint formed between each end plate and said core and betweeneach end plate and said shaft and having sufficient length to quenchtherein ignited .a heat dissipating surface therefor, a separate closedend plate arranged upon each end of said core and forming therewith aclosed inner casing having sufficient strength to resist a gaseous expsion within its interior,

fasteners to retain said end plates in place upon said core, a rotorarranged within said stator and having its shaft bearing in said endplates, an elongated joint formed between each end plate and said coreand between each end plate and said shaft and having sufficient lengthto quench therein ignited gas from within said inner casing, and anouter casing arranged around said inner casing to form a ventilatingspace for ,the passage of external air over said core.

13. A dynamo electric machine, comprising a stator provided with alaminated core having its heat dissipated to external air by I directmetallic conduction, a closed end plate arranged upon eacltend of saidstator and forming therewith; a closed inner casing having sufficientstrength to resist' and confine a gaseous explosion within its interior,an elongated joint connecting each end plate with said, stator andhaving sufiicient length to quench ignited or exploded gas from withinsaid inner casing before it reaches the exterior thereof, a rotorarranged within said stator and carried by a shaft having a bearing ineach end plate, an elongated joint connecting each end plate with saidshaft and having sufficient length to quench ignited or exploded gasfrom within said inner casing before it reaches the exterior thereof,and an outer casing arranged outside said inner casing to conductexternal air over said core.

.1 1. A dynamo electric machine, comprising a stator provided with alaminated core having its heat dissipated to'external air bydirectrnetallic conduction, a closed end plate arrangedupon each end ofsaid stator and forming therewith a closed inner casing havingsufficient strength to resist and confine a gaseous'explos'ion withinits interior, an elongated joint connecting each end plate with saidstator and having sufficient length to quench ignited or exploded gasfrom within said inner casing before it reaches the exterior thereof, arotor arranged within said stator and carried by a shaft having'abearing in each end plate, an elongated joint connecting each end platewith said shaft stator and carried by a shaft having a bearing reachesthe exterior thereof, and an outer,

caslngarranged outside said inner. casing' i ter or thereof, a rotorarranged within said to conduct external air over said core.

15. A dynamo electric machine, comp ris ing a stator pr'ovided with alaminated core having its heat dissipated to external vair by directmetallic conduction, a closed end plate arranged upon each end ofsaidstator and forming therewith a closed inner casing having sufficientstrength to resistand con-v fine a gaseous explosion within itsinterior, bolts connecting said end plates to each other to fasten thesame in place upon said stator, an elongated joint connecting each endplate with said stator and having sufficient length to quench ignited orexploded gas from Within said inner casing before it reaches theexteriorthereof, a rotor arranged within said in each end plate, an elongatedjointconmeeting each end plate with said-shaft apart.

from said bearing and having sufficient length to quench ignited orexploded gas from within said inner casing before it:

reaches the exterior thereof, and an outer casing arranged outside saidinner casing to conduct external air over said core.

16. A dynamo-electric machine, comprising a stator provided witha-laminated core having'its heat dissipated to external airbydirectmetallic conduction, a closed end plate arranged upon each end ofsaid stator and forming therewith a closed inner casing havingsufiicient strength to resist and confine a gaseous explosion within itsinterior, an elongated joint connecting each end plate with said statorand having sufficient length to quench ignited or exploded gas fromwithin said inner casing before it reaches the exterior thereof, a rotorarranged within said stator and carried by a shaft having a bearing ineach end plate, a sleeve connecting said end plate with said shaft apartfrom said bearing and forming an elongated joint between said end plateand said shaft having suflicient length to quench ignited or explodedgas from within said inner casing before it reaches the exteriorthereof, an outer casing arranged outside said inner casing to conductexternal air over said core, a fan carried by said shaft to causeexternal air to pass through said outer casing, and an end casingenclosing said fan.

17. A dynamo electric machine, comprising a stator provided with alaminated core having its heat dissipated to external air by directmetallic conduction, a closed end plate arranged upon each end of saidstator and forming therewith a closed inner casing having sufficientstrength to resist and confine a gaseous explosion within its interior,bolts connecting said end plates to each other to fasten the same inplace upon said stator, an

to quen 'ch ignited orex lo ded gas from within said innercasing be oreitreaches the exstator and-carried by a shaft having a bearing vinv eachend plate, a. sleeveconnecting saidend plate iwithsaid shaft apart fromsaid bearing and forming an elongated joint v between said' end plate"and said shaft havexploded gas from within said 'inner casing before itreachesthe exterior thereof, and an outer casing arranged outside saidinner casing to conduct external air over said core.

18. A dynamo electric machine, comprising a statorprovided with alaminated core having its heat dissipated to external air bydirect'metallic conduction, a closed end plate arranged uponsaid'sta'tor at the end thereof to form therewith, a closed innercasinghaving suflicient strengthto resist and confine a gaseousexplosion within its interior, an elongated joint connecting said endplate with said stator and having sufficient length toquench ignited orexploded gas from within said innercasing before it reaches the bearingin said end plate, an'elongated joint connecting said end plate withsaidshaft apart from said bearing and having sufficient length to quenchignited or exploded gas from Within said inner casing before it reachesthe exterior thereof, and an outer casing arranged outside said innercasing to conduct externalair over said core.

.19. A dynamo electric machine, compris ing a stator providedxwith alaminated core having its heat dissipated to external air by directmetallic conduction, a closed end plate arrangedupon said stator at'the'end thereof to form therewith a closed inner casing havingsufiicient strength to resist and confine a gaseous explosion within itsinterior, an elongated joint connecting said end plate with said statorand having sufficient length to quench ignited or exploded gas fromwithin said inner casing before it reaches the exterior thereof, a rotorarranged within saidstator and carried by a, shaft having a bear inglinsaidend plate, a sleeve connecting said end platelw ith said shaft apartfrom said bearing and forming an elongated joint between said endplateandsaid shaft having sufficient length to' quench ignited orexploded gas from within said inner casmg beforeit reaches the exteriorthereof, and an outer casing arranged outside said inner casing toconduct external air over said core.

20. A dynamoelectr'ic machine,c0mpr1sing a stator provided with alaminated core arranged within a heat conducting shell in directengagement with itslaminations, an

end ringarranged upon each endof said laminations and fastened to saidshell, a closed end plate arranged upon each end of said :nercasingthereof, :awrotor-xarrangedfwithin 1said-staton end stator inen-gagementiwithits adjoining-tend :ring; and

"forming, wzth.z 'said stator acIO'sed innercasingrhavmgasufiieientfstrength to-1 esist' and confi'ne a :ga'seousexplosion within "its interior, an elongatedjoint. formed be} tween eachend' lp'lat'e and i its: adj oini ngi end ring-andwh aving snfiic'ientilength: itoiwqnench "ignited or ex 'loded-legaszfrom .wlithin:saiiddnefore- :it: gneaohes the exterior I from :withinsaid. innercasing before it- :and said ,reachesthe exterior: thereof, and: anrouter.

casing arrangedzzoutsi'de. said i'nner -casing: to Y conductexternallair-overx-said core.

21. A dynamo electric imachinej comprising a stator provided withi-a'laminated core arranged within aheat-xconducting shell in directengagement with its laminat1ons,.an-end1 ring arranged upon-each end ofsaid-laminations and fastened to :said shell, ,a closed end platearranged: "upon each end of -said stator inengagementzwithitsadjdiningend ring and .formin'g. with said -stator 1a closedinner-casing havings'sufiicient strength ,to =re- 1 sist and confineangaseousaexplosion: with-in its interior, bolts connectingsaid endplates together to fasten-the same-in place :upon said stator, anelongated joint. formed between each vend plate 'and lts adjoining'iend'ring and having snflicient, length to' "quench ignited or-explodedfgasfromwithin said inner rcasingbeforeitireachesztheexterior thereof, .arotor arranged withi'nwsaid stator-and carr-ied, by a shaft havingrabearing in-eachend plate, asleeve-connecting-said plate with saidshaft'apartlfromsaid bearing'and forming an elon ated joint:between"saldend plate s aft having sufiicient length to quench ignitedor' ex loded'gas 'from w'ithin.

said inner casing'be ore it reaches the extenor thereof, andarr-outercasing arranged outside saidinner casing to :conduct externalair .over saidj eorel,

'22. A. dynamo-electrie machine, compvis- 'ing-a statorfprovided with alaminated core' having its laminations exposed todirect' 1. contact withexternal ;ain,-.a iclosed'end plate 111'- rangedxuponeach end :of" saidacore; and formsaid ineegmi bearing and "having sufileient length ftoquench :ignitedor exploded "gas 'fromiwith nnerr'casing-beforeitreaches-the exterior thereofiand'an-outer casingarnanged outside saidrinner casingtoconduct-externalair oversaidkcore. g

,23..A dynamo-electric machine, GOIHPI'lS, ing-ia stator provided withalaminated-core, having its ilaminationsexposed to direct con- .tactwithexternal .air,

jointi'connecti-ngeach'end'aplate withsaidocore andhavingnsuflicientlengthto:quenchgignited a closed end-. plate argrangedupon eachend? of. said core and form- I :sufiic'ient strength to resistandconfine a gaseore-exploded gas from within saidinnercasing. :beforeit''reaches the exterior thereof, a rotorvarranged within said core andcarried fiby -ashafitz'havi ngqa bearing in each lend-plate," anelongated ijoint connecting each end-plate with smashed 'apartfrom saidbearing and .h-avingsufiicient length'sto quench ignited or ex; loded agas from within said inner casing be oreitreaches the exteriorthereofianouter casing arranged conduct external airover saidcore, a fancarried hy'said shaft to causeexternalzair to'pass through said outercasing, and an end casing.

"enclosing-said fan.

' In witness-whereof, I' have hereunto subscribed my name.

HAROLD- LI SMITH.

outside 'saidinner casing to ingitherewith a, closed sinner casinghaving su cient strengthztoiresistz and-confine agase ous explosionwithin its interior, an elongated ]oi'nt connecting each-end plate withsaid core and hav i'n sufiicien't length to quench ignited :or'exp odedgas from within said-inner casingiheforezitmeaehes the; exterior.thereofiwia:rotori'arranged withinsaid core-and.

carried bya shaft havi'ng aibearing in each end plate, an elongated ointconnecting eachend plate with said shaft apart f'rom' said

